Backlight Module Protrusions Reduce Visual Angle Without Brightness Loss
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Solution Overview
Problem
Conventional anti-peeping display devices use films that reduce brightness and display effect by limiting the visual angle, as they shield light, which is not effective in maintaining security without compromising display quality.
Innovation Solution
A backlight module with a light guide plate, lens, and protrusions that allow light to be incident and exit perpendicularly, reducing the visual angle without the need for anti-peeping films, thereby enhancing the display effect while maintaining security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-peeping film with a light shielding bar is provided on the display device, then the visual angle range is reduced and security is improved, but the brightness of the liquid crystal display panel is reduced and display effect deteriorates
Solution Approach 1:
The invention extracts the anti-peeping function from the anti-peeping film and integrates it into the backlight module structure. By incorporating light shielding bars directly into the backlight module, the display device no longer requires a separate anti-peeping film, thus eliminating the brightness reduction caused by the film while maintaining the visual angle limitation function.
Solution Approach 2:
The invention merges the light shielding function with the backlight module structure. The light shielding bars are integrated into the backlight module components (such as the light guide plate or diffuser plate), combining the illumination function with the anti-peeping function into a single integrated structure, thereby avoiding the need for an additional anti-peeping film layer.
2Reliability
If an anti-peeping film is installed to reduce visual angle, then security against peeping is improved, but the display effect and brightness are reduced
Solution Approach 1:
The invention combines the anti-peeping function with the backlight module structure, integrating multiple functions into a single component. The light shielding bars are incorporated into the backlight module assembly during the manufacturing process, eliminating the need for separate anti-peeping film installation steps and reducing overall manufacturing complexity.
Solution Approach 2:
The backlight module is designed to perform multiple functions: illumination, light distribution, and anti-peeping protection. By making the backlight module multi-functional, the invention reduces the total number of components and assembly steps, thereby simplifying the manufacturing process and reducing production costs.
3Shape
If a light shielding bar is provided on the anti-peeping film, then the visual angle is reduced for security, but the brightness of the display panel is reduced
Solution Approach 1:
The invention relocates the light shielding bars from the anti-peeping film layer to the backlight module layer, changing the spatial dimension where the light control function is implemented. By positioning the light shielding bars in the backlight module, the light can be directed more efficiently toward the display panel, maintaining brightness while achieving the desired visual angle limitation.
Solution Approach 2:
The light shielding bars in the backlight module act as an intermediary structure that controls light distribution before the light reaches the display panel. This intermediary positioning allows for optimized light path management, ensuring that sufficient light reaches the display panel for high brightness while the shielding bars effectively limit the visual angle for security.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves an anti-peeping effect by reducing the visual angle without installing anti-peeping films, thus improving the display effect and maintaining brightness, simplifying manufacturing and reducing costs.
Implementation Method 1
light emitted from the light source is incident upon the light guide plate through the lens at a same incident angle
Implementation Method 2
the light emission surface of the light guide plate is a total reflection surface except the regions where the protrusions are provided
Implementation Method 3
a surface for performing a first reflection on light incident upon the protrusion is a total reflection surface
Data Source
AI summary
A backlight module and an anti-peeping display device are provided. The backlight module comprises a light guide plate, a lens and a light source. The lens is provided between the light source and the light guide plate, and light emitted from the light source is incident upon the light guide plate through the lens at a same incident angle; a light emission surface of the light guide plate is provided with protrusions, the light emission surface of the light guide plate is a total reflection surface except the regions where the protrusions are provided; a light emission surface of the protrusion is parallel with that of the light guide plate, a surface for performing a first reflection on light incident upon the protrusion is a total reflection surface, and the light incident upon the protrusion exit perpendicularly to the light emission surface of the protrusion after being totally reflected once.